Demountable rim



Ymay 5, 1925.

w. N. BOOTH DEMOUNTABLE RIM Filed Aug. 27. 1921 2 sheets-sheet 1 May 5, 1925.

W; N. BOOTH D'EMOUNTABLE RIM 2 Sheets-Sheet 2 Filed Aug. 27, 1921 @am WMM-LL /Mdfzpw Juf/m4,

f vehicle wheel.

Patented May 5, 1925.

WILLIAM N. BOOTH, OF DETROIT, MICHIGAN.

DEMOUNTABLE RIM.

Application filed August 27, 1921.

To all whom t may concern:

Be it known that I, WILLIAM N. BOOTH, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Demountable Rims, of which the following is a specification, reference being had therein to the accompanying drawings. l

The invention relates to demountable rims and is designed particularly for use with the larger sized pneumatic tires for trucks and the like. The object of theinvention is the provision of a demountable rim which is simple and reliable and which is so constructed that a tire can be readily applied or removed. Other objects are the provision of means upon the main section of the demountable rim for detacha-bly engaging a toolv for expanding and contracting the main section; and also the provision of means upon the filler section of the demountable rim for preventing the creeping of the demountable rim upon the fixed rim of the Further objects of the invention reside in the novel features of construction as more fully hereinafter set forth.

In the drawings:

Figure l is a perspective View of a demountable rim embodying my inventionand showing a pneumatic tire in place;

Figure 2 is a side elevation of a portion of the demountable rim and showing an expanding and contracting tool in operative `position Figure 3 is a plan view thereof;

Figure i is a cross section tlieretlu'ol'lgh.

rihe demountable rim comprises the transversely split main section l and the filler section 2 fitting between the ends of the main section. Both the main and filler sections have upon their inner peripheries the pair of registering beads 3 :adapted to seat upon the fixed rim of the vehicle wheel and the side flanges 4L adapted to engage the tire retaining rings 5.

In order to normally retain the filler section 2 from radial inward movement when fitting between the ends of the main section, l, the cooperating end bearing surfaces of the filler and main sections slightly diverge outwardly relative to lines passing through the bearing surfaces and extending parallel to the nadius of the rim passing through the peripheral center of the filler section this divergence at eachend being approxi- Serial No. 495,930.

mately two degrees in the present instance. The filler section has the inwardly projecting portion 6 located between the beads and adapted to engage suitable driving lugs or `the like upon the fixed rim of the vehicle the tire retaining rings 5 over the side fianges L of the main section and afterwards removing the tire.

To expand and contract the main section l there are the curved plates 8 secured to and fitting the inner periphery of the main section near its ends, these plates being detachably engageable by the expanding and contracting tool 9. This tool has the anchors lO which have adove-tailed engagement with the plates to prevent inward movement of the anchors from the plates. The lower faces of these anchors are arcshaped, their radius of curvature being substantially the radius of curvature of the demountable rim. To retain the anchors in predetermined peripheral adjustment upon the plates, each of the latter has in one of its edges the transverse recess ll which is engageable in. by the end of la thumb screw 12 threadedly engaging an anchor. flach anchor has the bifinfcations 13 which have transversely aligned apertures in which is journalled a pivot 14 threadedly engaged by one end of the rod 15. This rod has right and left handed threads at its ends so that upon rotation in one direction, the pivots and consequently the ends of the main section are spread apart while rotation in the opposite direction moves the same toward each other.

With the parts in place as shown in Figure l, if it is desired to remove the tire the expanding and contracting tool 9 is applied by sliding its anchors l0 over the plates 8 until the transverse recesses ll register with the thumb screws when the latter are tightened down. The threaded rod l5 is then rotated to expand the main section l sufficiently to permit of moving the filler section 2 radially inward. After the filler section 2 has been removed, the threadedrod is Athen rotated in the opposite direction to bring the ends of the main section adjacentto the air valve at which time Vthe tire retaining rings 5 may be removed over the side flanges l as Well as the. tire. To apply the tire and replace the filler section, these operations are reversed.

From the above description it will be seen that the filler section is held in place Without the necessity of an extra securing member. YI"urthermore, this filler sectionY retains the demountable rim in fixed peripheral adjustment upon the yfixed rim of the vehicle wheel.

That I claim as my invention is:

l. In a demountable rim, the combination with a transversely7 split main section having its ends adapted to be moved vaway from or toward each other, and plates secured to said ends having undercut sides for detachable engagement with an expanding and contracting tool, of a liller section insertable between said ends, the outer periphery of said filler section corresponding substantially to that of said main section, and the end bearing surfaces of said filler section and main section slightly ydiverging out- Wardly from lines passing` through said end bearing surfaces land extending parallel to the radiusv of said rim passing through the peripheral center of said filler section.

2. In a demountable rim, the combination with a transversely split main section having its ends adapted to be moved away from or toward each other, and plates secured to said ends having undercut sides for detach` able engagement with an expanding and contracting tool, of a filler section insertable between said ends, the outer periphery of said Iiller section corresponding substantially to that of said main section, and the end bearing surfaces of said filler section and main sectionbeing arranged to normally retain said filler section from radial in- Ward movement relative to said main section, and means surrounding said main and liller sections and limiting the radial youtward movement of said filler section relative to said main section.

In .testimony whereof I affix my signature.

VILLIAM N. BOOTH. 

